Service Manual Instruction Manual

SECTION 5 - HYDRAULICS
5-48 – JLG Lift – 3121171
HIGH PRESSURE RELIEF - 3200 PSI (220.6 BAR)
1. Install a high pressure gauge at the MP1 port of the
main valve block.
2. Using a screwdriver, remove the Din connector from the
telescope proportional flow coil.
3. Activate telescope in. The gauge should read 3200 psi
(220.6 bar).
4. To make an adjustment to this pressure on a Rexroth
pump, go to the engine compartment and locate the
function pump which is the back pump. The high pres-
sure relief adjustment is the adjustment closest to the
pump. Using a 17 mm wrench, remove the cover nut. Be
careful not to lose the o-ring washer inside the cover
nut. Loosen the jam nut at the setscrew with the 17 mm
wrench. Using a 3 mm allen wrench, adjust clockwise to
increase, or counterclockwise to decrease pressure.
To make an adjustment to this pressure on a Sauer
pump, loosen the 4 mm setscrew towards the engine.
Using a 6 mm allen wrench, turn clockwise to increase
pressure and counterclockwise to decrease pressure.
5. After adjusting the pressure, tighten the jam nut and the
cover nut if applicable. This is the maximum
relief pres-
sure for all the functions governed by this pump.
Adjustments made at the Main Valve Bank
SWING 1500 PSI (103.4 BAR)
1. Install turntable lock pin.
2. Install high pressure gauge at port "M13".
3. Activate swing right.
4. Swing right relief valve is located on top surface of valve
directly behind "M13". The adjustment is below the
outer plug. Turn CW to increase pressure.
REXROTH PUMP
SAUER PUMP